Head for surfacing-machines.



No. 883,920. PATENTED APR. '7, 1908. J. F. STOLL.

HEAD FOR SURFAOING MACHINES.

APPLICATION FILED 0GT.23,1907.

.www

' 5 if 4- fz l" l fo A n'- CJI JOHN F. STOLL, OF CUYAHOGA FALLS, OHIO.

HEAD FOR SURFACING-MACHINES.

Specification of Letters Patent.

Patented April v7, i908.

Application filed Gctuber 23, 1907. Serial No. 398,782.

To all whom it may concern:

Be it known that I, JOHN F. STOLL, a citizen of the United States, residing at Cuyahoga Falls, in the vcounty of Summit and State of Ohio, have invented new andluseful Improvements in Heads for Surfacin Machines, of which the following is a speci cation.

This invention relates to heads Afor surfacing machines and especially those designed to be used on floors, bowling-alleys and the like, and the object thereof is. to provide an improved head especially designed to carry sand or carborundum paper as the abrasive agent and having means by which the dust or particles due to the attrition of the abrasive agent ma be constantly carried away to prevent its c ogging and /being filled, which 1n a short time would impair its action and render it inoperative.

Broadly speaking, the invention contemplates lproviding a head for surfacing machines aving an annular member on which is held a ring of sand or carborundum paper and provided with means to draw the dust from and around the exterior of th ring of sand or carborundum paper as well as from the central opening therein.

Other advanta es constituting objects of this invention more fully appear in the subjoined description. y

A practical embodiment of this invention is illustrated in the accompanying drawings in which similar reference numerals indicate like parts in the different figures.

Figure 1 is a side elevation with portions thereof in section to better illustrate the construction thereof; and, Fig. 2 is a bottom plan of the same.

Referring specifically to the drawings, the reference numeral 1 denotes a rotatable shaft adapted to-be carried by the surfacing machine and revolved at high speed by .any motive ower carried thereby.

Fixedly secured to the lower end of the shaft 1 is a hub 2 from which extend arms 3 preferably inclined at an angle and having ormed' integral therewith an annulus Aa.

This annulus 4 has a fiat under surface to which is secured a similarly constructed edge 5.- The annulus 4 is provided with a eveled threaded outer periphery arran ed to receive an internally threaded annu arlyformed clam ing member provided with an inclined portion to engage the beveled edge 5 of the member 11. Secured to the under faces lof the wooden member 11 preferably by means of an adhesive material is a layer of non-heating substance such a asbestos 13 for a purpose to be stated.

Surrounding the entire device and fitting closely to the shaft 1 is an irrevoluble hood 7 adapted to be carried with the head by being attached, if desired, to the frame of the surfacing machine, so that at all times it incloses-the head and a part of the shaft 1. This hood 7 is provided with an off-take pipe 8 connected wlth a suitable exhaust means such as a fan (not shown) by which the dust laden air within the head is carried off `to some suitable receptacle. In setting up a device-such as is shown in the drawings, the clam ing member 6 is unscrewed from the annulus 4 and a ring of sand or carborundum paper or other suitable abrasive material 9 is placed on the under surface ofthe member 11 and the outer edge thereof is lapped over the beveled edge 5. The clamping member 6 is then secured in place, its lower inwardlyinclined surface clam ing the abrasive agent securelyf against the beveled edge 5, thereby holding the samefixedly in positlon. Motion is then communicated to the shaft 1 which rapidly revolves the abrasive a ent over the surface which it is adapted to h and the dust thrown off into the hoodis carried awa by means of asuitable exhaust agent throu h the off-take pipe 8. Of course,inpractice, t e surfacing machine will be provided, if desired, with a suitable means to propel it over the floor or like surface which the device is` adapted to operate on, so that all portions thereof are treated -alike by the operation of this head. It will be noted that the dust driven outward by the centrifu al action of the ring of abrasive materia 9 will be forced upward around and outside of the clamping member 9 and from thence to the off-take plpe 8, and also any dust which accumulates in the space 10 inclosed by the annulus 4 will escape to the pi e 8 by reason of the annular formation of t e head. The obstruction oered to the passage of dust upward by the spokes 3 is so insignificant as to be unimportant. In practice, it is common to place a plurality of layers of abrasivematerial in yposi-l tion at one time, and as rapidly as one becomes clogged or inoperative, itis torn loose and the next succeeding layer under it is utilized,- thus avoiding the necessity of removing the clamping member 9 each time a piece becomes Worn, thereby increasing the effectiveness and Yspeed of the entire device.

Experience has demonstrated that if the abrasive material is placed immediate contact with the metallic annulus 4., the heat generated by the rapid motion of the device is so 'great as te be communicated to the shaft 1 and from thence upward to the bearin in which it runs whic rapidly impairs t e action thereof. In order to eliminate this trouble the Wooden member l11 is placed beneath the annulus 4 and the under surfaces of the'Wooden member l1 are covered With a sheet of heat-resisting material such as asbestos Which tends to keep the metallic portions of the device cool, thereby permitting the machine to run a longer period and at a higher speed than Would be possible if the abrasive material Was placed immediately on the metal surface of the annulus-4.

It Will be seen from the foregoing that the,

member which holds the abrasive material is really a composite member composed of a sive material to the metallic member, thusproviding the abrasive material With a heat insulatin device. s

What claim and desire to secure by Let- A head for surfacin machines com rising a rotatable shaft, a ub mounted v t ereon rovided With a plurality of arms, an annuar member on the end of said arms, said member being 'provided' with a threaded periphery and a beveled portion extendin from said threaded por'tion to the face of sai member, a strip of heat-resisting material on the face 4of said member, a piece of abrasive material covering said heat-resisting material, and a clamping. element for securing said heat-resistingand labrasivematerial to said annular member.

In testimony whereof I have hereunto set my hand inpresence of two subscribing witnesses.

JOHN F. STLL. Witnesses:

C. E. HUMPEREY, GLENARA Fox. 

